When I pick up rough cut lumber from various places the end of the boards will be painted. I have seen white paint on Walnut boards ends and blue paint on Maple board ends. Is this paint marking a standard code used in the lumber industry?

Yeah, I’ve got eastern hard maple here with red ends, scraps bought from a place that buys it by the container, and a variety of things from a more local dealer with black and blue ends. So, no particular pattern here, and it doesn’t match what you’re seeing.